This page explains how Lanfei Chen (USATT# 197032)'s rating went from 1438 to 1425 at the Roslyn-Long Island Sports Center (LISC) League event from 13 Apr 2018. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.